docs: def _init_trace_logging(self, app):
          """
          Sets up trace logging unless ``APPINSIGHTS_DISABLE_TRACE_LOGGING`` is
          set in the Flask config.
  
          Args:
              app (flask.Flask). the Flask application for which to initialize the extension.
          """
          enabled = not app.config.get(CONF_DISABLE_TRACE_LOGGING, False)
  
          if not enabled:
              return
  
          self._trace_log_handler = LoggingHandler(
              self._key, telemetry_channel=self._channel)
  
          app.logger.addHandler(self._trace_log_handler)